CN102411291B - Driving arrangement and image processing system - Google Patents
Driving arrangement and image processing system Download PDFInfo
- Publication number
- CN102411291B CN102411291B CN201110275271.4A CN201110275271A CN102411291B CN 102411291 B CN102411291 B CN 102411291B CN 201110275271 A CN201110275271 A CN 201110275271A CN 102411291 B CN102411291 B CN 102411291B
- Authority
- CN
- China
- Prior art keywords
- rotary part
- rotation
- jockey pulley
- transfer belt
- intermediate transfer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
- G03G15/1615—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0105—Details of unit
- G03G15/0131—Details of unit for transferring a pattern to a second base
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
- G03G15/0189—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to an intermediate transfer belt
Abstract
The present invention relates to driving arrangement, it comprises tension part, and supports the first rotary part and second rotary part of tension part in the mode of tensioning.First rotary part has the first rotation, and the second rotary part has the second rotation.First rotary part comprises the multiple parts on the axial direction being arranged in described first rotation.
Description
Technical field
The present invention relates to driving arrangement, wherein, tension part (such as, endless belt) is around multiple roller tensioning and moved by roller, and relates to the image processing system using this driving arrangement.
Background technology
Propose a kind of for preventing the technology (No. 2006-162659, Japanese Laid-Open Patent Publication) of endless belt deflection.
But, although prior art can prevent the deflection of endless belt, endless belt (that is, tension part) life-time dilatation can not be realized fully.
Summary of the invention
The present invention wishes to solve the problem, and a target of the present invention is to provide driving arrangement and the image processing system in the life-span that can extend tension part.
According to an aspect of the present invention, provide a kind of driving arrangement, it comprises tension part, and the first rotary part and the second rotary part, and tension part is around the first rotary part and the second rotary part tensioning.First rotary part has the first rotation, and the second rotary part has the second rotation.First rotary part comprises the multiple parts on the axial direction being arranged in described first rotation.
With this structure, the life and reliability of tension part can be strengthened.
According to a further aspect in the invention, the image formation unit comprising above-mentioned driving arrangement is provided.
Other scope applicable of the present invention will become clear from detailed description provided below.But, should understand, although to describe in detail and specific embodiment indicates the preferred embodiments of the present invention, it only provides by way of illustration, because those skilled in the art know various change within the spirit and scope of the present invention and modification by from detailed description.
Accompanying drawing explanation
In accompanying drawing:
Fig. 1 is the schematic sectional view of display according to the structure of the image processing system of the first embodiment of the present invention;
Fig. 2 is the block diagram of display according to the control system of the image processing system of the first embodiment;
Fig. 3 is the skeleton view of display according to the transfer belt unit of the first embodiment;
Fig. 4 is the sectional view of the transfer belt unit obtained along the line IV-IV in Fig. 3;
Fig. 5 is the sectional view of display according to the driven roller of the first embodiment;
Fig. 6 is the skeleton view of display according to the roller segment of the jockey pulley of the first embodiment;
Fig. 7 A, 7B and 7C are the sectional views of the jockey pulley obtained along the VII-VII line of Fig. 4;
Fig. 8 is the enlarged drawing of display according to the structure of the end of the jockey pulley of the first embodiment;
Fig. 9 A, 9B and 9C are the schematic diagram of display according to the operation of the structure of the end of the jockey pulley of the first embodiment;
Figure 10 is the decomposition diagram of display according to the structure of the end of the jockey pulley of the first embodiment;
Figure 11 A, 11B, 11C and 11D are the schematic diagram of the deflection of display intermediate transfer belt;
Figure 12 is the schematic diagram of the tilt operation of display jockey pulley;
Figure 13 is the schematic diagram of the tilt operation of display jockey pulley;
Figure 14 is the schematic diagram of display according to the tilt operation of the jockey pulley of the first embodiment;
Figure 15 is the figure of the relation between the display separation number of jockey pulley and moment ratio rate;
Figure 16 A and Figure 16 B is the planimetric map of the jockey pulley shown according to a second embodiment of the present invention;
Figure 17 is the planimetric map of display according to the jockey pulley of the second embodiment;
Figure 18 A is the planimetric map of the modification of the jockey pulley of display second embodiment;
Figure 18 B is the schematic diagram of the shape of the jockey pulley of display Figure 17;
Figure 18 C is the schematic diagram of the shape of the jockey pulley of display Figure 18 A;
Figure 19 is the planimetric map of the modification of the driven roller of display second embodiment;
Figure 20 A and 20B is the enlarged drawing of the modification of the structure of the end of the jockey pulley of display second embodiment.
Embodiment
Below, with reference to the accompanying drawings embodiments of the invention are described.
First embodiment
Structure
Fig. 1 is the schematic diagram of display according to the structure of the image processing system 10 of the first embodiment of the present invention.
Image processing system 10 is configured to the electrophotographic printer of such as intermediate transfer type.Image processing system 10 comprises dielectric disc 11, wherein stores recording medium (such as, sheet material) P.Medium feed unit 12 is arranged on the feeding side (that is, the left side of Fig. 1) of dielectric disc 11.Medium feed unit 12 is configured to recording medium P to be fed to out dielectric disc 11 one by one.Medium feed unit 12 comprises picks up roller 12a, and this is picked up roller 12a and is pressed against on the recording medium P of the top being raised to predetermined height.Medium feed unit 12 also comprises feed roller 12b and reduction roll 12c, for being fed to individually by the recording medium P picking up roller 12a and pick up.Medium transfer unit 13 is arranged on the downstream of medium feed unit 12 on the direction of transfer of recording medium P.Medium transfer unit 13 comprises multiple transfer roller to 13a, 13b and 13c, for being transmitted to transfer roll 15 described later by recording medium P.
Image forming part 20 comprises four ink powder image forming unit 30(30C, 30M, 30Y and 30K) as developer image formation unit, four transfer rolls 14(14C, 14M, 14Y and 14K) and transfer roll 15.Ink powder image forming unit 30 arranged in series, and form ink powder image (that is, developer image) respectively.Transfer roll 14 is configured to ink powder image is transferred to intermediate transfer belt 41 described later.Transfer roll 15 is configured to the ink powder image from intermediate transfer belt 41 to be secondarily transferred to recording medium P.Therefore, transfer roll 14 is also referred to as primary transfer roller, and transfer roll 15 is also referred to as secondary transfer roller.
Ink powder image forming unit 30 comprises the OPC(Organophotoreceptor of the image carrier as carrying ink powder image) drum 31(31C, 31M, 31Y, 31K), as the charging roller 32(32C making the electronegative charging unit in the surface of OPC drum 31, 32M, 32Y, 32K), as the printhead 33(33C making the surface of OPC drum 31 expose the exposing unit to form sub-image, 33M, 33Y, 33K), as making sub-image video picture to form the developing roll 34(34C of the video picture parts of ink powder image, 34M, 34Y, 34K), and ink powder is fed to the developer feeding unit 35(35C of developing roll 34, 35M, 35Y, 35K).Printhead 33 is by such as LED(light emitting diode) array forms.
Namely transfer belt unit 40 as driving arrangement (that is, tape drive) comprises intermediate transfer belt 41(, tension part).Intermediate transfer belt 41 is also as ink powder (developer) image carrier.Intermediate transfer belt 41 is endless belts, and is configured to carry by the ink powder image of transfer roll 14 primary transfer.Transfer belt unit 40 also comprises the driven roller 42 as the second rotary part, the jockey pulley 43 as the first rotary part and backing roll 44.Driven roller 42 is driven by CD-ROM drive motor 110, and drives intermediate transfer belt 41 by the band direction of transfer shown in arrow X in the counter clockwise direction corresponding to Fig. 1.Jockey pulley 43 is set in the face of driven roller 42.Intermediate transfer belt 41 is around driven roller 42, jockey pulley 43 and transfer roll 15 tensioning (winding).Backing roll 44 is placed through intermediate transfer belt 41 and in the face of transfer roll 15.
Transfer belt unit 40(is as driver element) be included in correction unit 50(Figure 10 of the end of jockey pulley 43).Correction unit 50 comprises arm 52, spring 53L and 53R, bearing 54L and 54R, bar 55 and belt pulley 56.These parts will described in detail afterwards.
The downstream of fixation portion 16 is arranged on (as secondary transfer roller) transfer roll 15.Fixation portion 16 is configured by and applies heat and pressure and by ink powder image (that is, developer image) fixation in recording medium P.Fixation portion 16 comprises top roll 16a and lower roll 16b, and these two rollers all have the superficial layer be made up of elastic body.Top roll 16a and lower roll 16b has Halogen lamp LED 16c and 16d(wherein as internal heat resource).
Distributing roller is arranged on the downstream in fixation portion 16 to 17a, 17b and 17c.Recording medium P is discharged to the outside of image processing system 10 by distributing roller to 17a, 17b and 17c.Stack portion 18 is arranged on the top of image processing system 10, and the recording medium P of discharge is placed on this stack portion.
Image processing system 10 has power source 120.Power source 120 provides electric power for the integrated operation of image processing system 10.Specifically, voltage is applied to charging roller 32(32C, 32M, 32Y, 32K by power source 120), developing roll 34(34C, 34M, 34Y, 34K), primary transfer roller 14(14C, 14M, 14Y, 14K) and secondary transfer roller 15(15C, 15M, 15Y, 15K).
Fig. 2 is the block diagram of the control system of the image processing system 10 of display first embodiment.
Image formation control unit 100 as control module comprises microprocessor, ROM, RAM, input/output port, timer etc.Image formation control unit 100 receives view data (print data) and control command from main equipment 10A, and performs the sequential control of whole image processing system 10, thus performs printing.
Printer Information is sent to main equipment 10A by I/F control module 101, analyzes the order sent from main equipment 10A, and the data that process sends from main equipment 10A.
Charging voltage control module 102 controls voltage is applied to charging roller 32 thus charges to the surface of OPC drum 31 according to the order from image formation control unit 100.
Head control module 103 controls printhead 33 utilizing emitted light according to the order from image formation control unit 100 makes the surface of OPC drum 31 expose to form sub-image on OPC drum 31.
Video picture voltage control unit 104 controls voltage to be applied to developing roll 34 according to the order from image formation control unit 100, to make ink powder (that is, developer) adhere to be formed in by printhead 33 sub-image on the surface of OPC drum 31.
Primary transfer voltage control unit 105 controls voltage to be applied to (once) transfer roll 14 according to the order from image formation control unit 100, (as endless belt or developer image carrier) intermediate transfer belt 41 to be transferred to by the ink powder image on the surface of OPC drum 31.
Secondary transfer printing voltage control unit 106 controls voltage to be applied to secondary transfer roller 15, the ink powder image from intermediate transfer belt 41 is transferred to recording medium P according to the order from image formation control unit 100.
Driving control unit 107 controls CD-ROM drive motor 112C according to the order from image formation control unit 100,112M, 112Y, 112K make OPC drum 31, charging roller 32, developing roll 34 rotate in image formation.
CD-ROM drive motor 110 is controlled according to the order from image formation control unit 100, to make driven roller 42 rotate move intermediate transfer belt 41 with driving control unit 108.The intermediate transfer belt 41 that is rotated through of driven roller 42 is delivered to jockey pulley 43 and backing roll 44, thus jockey pulley 43 and backing roll 44 also rotate.The transfer roll 15 of contact intermediate transfer belt 41 also rotates.
Feeding transmit control unit 109 controls feeding motor 115 and transmits motor 116 according to the order from image formation control unit 100, to be fed to and to transmit recording medium P.In this regard, be fed to motor 115 driving and pick up roller 12a, feed roller 12b and transfer roller to 13a and 13b.Transmitting motor 116 drives transfer roller to 13c.
Fixation control module 111 controls well heater 16c and 16d voltage being applied to fixation portion 16, to make ink powder image fixation to recording medium P according to the order from image formation control unit 100.More specifically, fixation control module 111 receives the temperature information from thermistor 113, for detecting the temperature in fixation portion 16, and performs the opening/closing control of well heater 16c and 16d.In addition, fixation control module 111 controls fixation motor 114, to rotate top roll 16a and lower roll 16b after the temperature in fixation portion 16 reaches predetermined temperature according to the order from image formation control unit 100.Fixation motor 117 drives the top roll 16a in fixation portion 16 and distributing roller to 17a, 17b and 17c.
Fig. 3 is the skeleton view of display according to the basic structure of the transfer belt unit 40 of the first embodiment.Fig. 4 is the sectional view obtained along the IV-IV line in Fig. 3.
Transfer belt unit 40 is configured so that intermediate transfer belt 41 is around three roller tensionings: driven roller 42, jockey pulley 43 and backing roll 43 as above.Driven roller 42 rotates intermediate transfer belt 41e is moved.Jockey pulley 43 has tension force roll shaft 43a, and its inclination can change as described later.
Fig. 5 shows driven roller 42.As shown in Figure 5, driven roller 42 has drive roller shaft 42b.Drive roller shaft 42b is supported rotatably by bearing 42L and 42R, and bearing 42L and 42R is installed to framework 51L and 51R(Fig. 3 of transfer belt unit 40).Driven wheel 42a is fixed to drive roller shaft 42b.The power transmission of CD-ROM drive motor 110 is to driven wheel 42a, and driven roller 42(is along with drive roller shaft 42b and driven wheel 42a) rotate around the rotation O1 as the second rotation.
In addition, driven roller 42 is metallic roll made of aluminum, is coated with ceramic coat.When driven roller 42 rotates, intermediate transfer belt 41 rotates due to the friction between driven roller 42 and intermediate transfer belt 41.
As shown in Figure 4, backing roll 44 is positioned at the downstream of driven roller 42 on band direction of transfer X.Backing roll 44 is made of aluminum, by being installed to framework 51L and 51R(Fig. 3) on bearing 45L and 45R support rotatably.
Jockey pulley 43 is positioned at the downstream of backing roll 44 on band direction of transfer X.Jockey pulley 43 has tension force roll shaft 43a, and this tension force roll shaft 43a can rotate around the rotation O2 as the first rotation.As shown in Figure 3, jockey pulley 43 is divided into multiple (such as, 5) roller segment 43-1,43-2,43-3,43-4 and 43-5 along the axial direction of tension force roll shaft 43a.That is, on the axial direction of the rotation O2 of tension force roll shaft 43a, multiple roller segment 43-1,43-2,43-3,43-4 and the 43-5 of the roller (or part roller) as multiple separation are comprised as the jockey pulley 43 of the first rotary part.
Fig. 6 is showing the skeleton view of the roller segment 43-1 in the roller segment 43-1 to 43-5 of the jockey pulley 43 of Fig. 3.Roller segment 43-1 to 43-5 has conjugate foramen (that is, center pit), and tension force roll shaft 43a is through these conjugate foramens.
Therefore, roller segment 43-1 to 43-5 can rotate independently around tension force roll shaft 43a.In addition, roller segment 43-1 to 43-5 uses e ring 58 to be installed to tension force roll shaft 43a, not move on the axial direction of tension force roll shaft 43a (Fig. 7 A, 7B and 7C).
Fig. 7 A, 7B and 7C are the sectional views obtained along the VII-VII line of Fig. 3.
As shown in Figure 7 A, the end of tension force roll shaft 43a is installed to as the belt pulley 56 of the 3rd rotary part.Belt pulley 56 has the flange part 56b as contact site (that is, being with contact site), and it is with the surface A of the lateral ends (that is, Width end) of contact intermediate transfer belt 41.Belt pulley 56 has conjugate foramen 56, and tension force roll shaft 43a is through this conjugate foramen.Belt pulley 56 can slide along tension force roll shaft 43a, that is, can move along the direction of rotation O2.Belt pulley 56 has the surperficial B relative with surface A.The surperficial B contact of belt pulley 56 (as axle offset parts) bar 55.Bar 55 is installed to framework 51L, makes it possible to rotate around the rotation O3 as the 3rd rotation, and this rotation O3 tilts relative to rotation O2.
Bearing 54L and belt pulley 56 are arranged on the same end of tension force roll shaft 43a.As shown in Figure 3, arm 52 is rotatably installed to framework 51L, makes to rotate around rotation 52a.Bearing 54L is arranged in the orbit portion 52b be formed on arm 52, can slide along the longitudinal direction of orbit portion 52b.
Spring 53L is arranged between the inwall of orbit portion 52b of bearing 54L and arm 52.Spring 53L is made up of compression helical spring, and last item holds 54L so that tension force is applied to intermediate transfer belt 41.
Bearing 54R is arranged on the end contrary with belt pulley 56 of tension force roll shaft 43a.Bearing 54R is slidably mounted in the orbit portion (not shown) be formed on framework 51R.Spring 53R(Fig. 4) be arranged on bearing 54R and framework 51R(Fig. 2) orbit portion inwall between.Spring 53R is made up of compression helical spring, and last item holds 54R so that tension force is applied to intermediate transfer belt 41.
As shown in Figure 4, the band dancer rools as band regulon is being with to 57 downstream direction of transfer X being arranged on jockey pulley 43.Band dancer rools comprises roller 57a and 57b to 57, and roller 57a and 57b is arranged so that and clips intermediate transfer belt 41 between which.The both ends of roller 57a are all rotatably supported by the unshowned bearing being installed to framework 51L and 51R.Similarly, the both ends of roller 57b are all rotatably supported by the unshowned bearing being installed to framework 51L and 51R.Roller 57a and 57b regulates the track of the movement of intermediate transfer belt 41.
As the transfer roll 14(14C of the first primary transfer parts, 14M, 14Y, 14K) be arranged on band direction of transfer X band dancer rools to 57 downstream.Each in transfer roll 14 is rotatably supported by the unshowned bearing being installed to framework 51L and 51R.Transfer roll 14 is pressed against OPC drum 31C, 31M, 31Y and 31K by crimping unit (not shown) by intermediate transfer belt 41.
As shown in Figure 7 A, e ring 58 and pad 59 are arranged between roller segment 43-5 and bearing 54R.In addition, another e ring 58 is arranged between roller segment 43-1 and bearing 54L.E ring 58 and pad 59 form adjustment member, this adjustment member dancer rools part 43-1 to 43-5 moving axially on the axial direction of jockey pulley 43.Belt pulley 56 has flange part 56b, and this flange part 56b contacts the lateral ends of intermediate transfer belt 41, as mentioned above.Bar 55 contacts the surperficial B of the belt pulley 56 contrary with intermediate transfer belt 41.Bar 55 is installed to framework 51L, can rotate around the rotation O3 as the 3rd rotation.
Roller segment 43-1,43-2,43-3,43-4 and 43-5 of jockey pulley 43 are rotatably supported by tension force roll shaft 43a.Gap " d " is formed, to suppress the generation of friction force between adjacent roller segment 43-1 to 43-5 on the axial direction of the rotation O2 of jockey pulley 43.
As shown in Figure 7 B, by providing annular relief 43b(namely on roller segment 43-1 to 43-5, abutting part) and form gap " d ".The diameter of diameter ratio (each jockey pulley 43) the band tensioned portion 43c of each lug boss 43b is little, and intermediate transfer belt 41 is around band tensioned portion 43c tensioning.The lug boss 43b of each roller segment 43-1 to 43-4 is against the abutting portion 43d of adjacent roller segment 43-2 to 43-5.
In this embodiment, roller segment 43-1 to 43-5 is of similar shape, to be conducive to reducing manufacturing cost.Therefore, namely roller segment 43-1 to 43-5 has lug boss 43b(in the same side, abutting part), these lug bosses 43b is against the abutting portion 43d of adjacent roller segment.But this embodiment is not limited to this structure.Such as, also can be: each roller segment 43-2 and 43-4 has two lug boss 43b in both sides, and each roller segment 43-1,43-3 and 43-5 have two abutting portion 43d in both sides.With this structure, above-mentioned gap " d " can be formed between adjacent roller segment 43-1 to 43-5, therefore, it is possible to suppress the generation of friction force.
Jockey pulley 43 is supported by the joint of tension force roll shaft 43a and bearing 54L and 54R.Prevent jockey pulley 43 from moving to bearing 54R by e ring 58 and pad 59.In addition, e ring 58 prevents jockey pulley 43 from moving to bearing 54L.Bearing 54L and 54R has automatic aligning function, and is configured to the inclination of following jockey pulley 43.
Under the state shown in Fig. 7 B, the rotation O2 of jockey pulley 43 is parallel to the rotation O1 of driven roller 42.In this condition, intermediate transfer belt 41 stably moves.
Under the state shown in Fig. 7 A, the rotation O2 of jockey pulley 43 is inclined upwardly relative to the rotation O1 of driven roller 42.In this condition, bar 55 rotates around rotation O3, and arrives near bearing 54L.
Under the state shown in Fig. 7 C, the rotation O2 of jockey pulley 43 is downward-sloping relative to the rotation O1 of driven roller 42.In this condition, bar 55 rotates around rotation O3, pressure belt pulley 56, and arrives the position closer to bearing 54R.
Fig. 8 is the enlarged drawing of display jockey pulley 43 at the structure of the end of belt pulley 56 side.In fig. 8, the rotation O2 of jockey pulley 43 is downward-sloping relative to the rotation O1 of driven roller 42, as seen in figure 7 c.According to the inclination of jockey pulley 43, bar 55 rotates up around the side of rotation O3 shown in arrow " a ", and is pressing belt pulley 56 by the direction shown in arrow D2.
The flange part 56b(of belt pulley 56 namely, contact site) there is tapered portion 56a.When intermediate transfer belt 41 will by flange 56b time, intermediate transfer belt 41 is guided to its original position by tapered portion 56a.
Fig. 9 A, 9B and 9C are the skeleton views of the operation of the end structure of display jockey pulley 43.
Under the state shown in Fig. 9 B, the rotation O2 of jockey pulley 43 is parallel to the rotation O1 of driven roller 42, as shown in Figure 7 B.In this condition, intermediate transfer belt 41 stably moves.
Under the state shown in Fig. 9 A, the rotation O2 of jockey pulley 43 is inclined upwardly relative to the rotation O1 of driven roller 42, as shown in Figure 7 A.In this condition, bar 55 is around rotation O3(Fig. 8) rotate, and contact arm 52.
Under the state shown in Fig. 9 C, the rotation O2 of jockey pulley 43 is downward-sloping relative to the rotation O1 of driven roller 42, as seen in figure 7 c.In this condition, bar 55 is around rotation O3(Fig. 8) rotate, pressure belt pulley 56, makes intermediate transfer belt 41 and jockey pulley 43 move towards bearing 54R.
Figure 10 is the skeleton view of the structure of the end being presented at the jockey pulley 43 shown in Fig. 9 A to Fig. 9 C.
Bar 55 has rotation O2 relative to jockey pulley 43 with the rotation O3 of predetermined angular slope.Bar 55 has the elongated hole 55a of generally elliptical shape.Tension force roll shaft 43a(omits in Fig. 10) through elongated hole 55a, and rotatable and remain on slidably in elongated hole 55a.Bar 55 has the protuberance 55b in the face of belt pulley 56, and protuberance 55b can contact belt pulley 56.Above-mentioned bearing 54L and spring 53L is arranged in the orbit portion 52b of arm 52.
Bar 55 has the rotation O3 tilted relative to the rotation O2 of jockey pulley 43.Therefore, when the left part (that is, belt pulley 56 side) of jockey pulley 43 offsets downward as seen in figure 7 c, bar 55 downwards and rotate towards jockey pulley 43, and presses belt pulley 56.
When the left part (that is, belt pulley 56 side) of jockey pulley 43 upwards offsets as shown in Figure 7 A, bar 55 upwards and rotate away from jockey pulley 43.
Figure 11 A, 11B, 11C and 11D are the schematic diagram of the deflection of the intermediate transfer belt 41 of display shown in Fig. 4.Figure 11 A and 11C schematically shows the track Xt of intermediate transfer belt 41 and the planimetric map of driven roller 42 and jockey pulley 43.In Figure 11 A and 11C, reverse relative to Fig. 7 A to 7C in left side and right side.Figure 11 B and 11D schematically shows the track Xt of intermediate transfer belt 41 and the outboard profile of driven roller 42 and jockey pulley 43.
Intermediate transfer belt 41 driven rolls 42 moves (rotation) along band direction of transfer X.If driven roller 42, jockey pulley 43 and backing roll 44 are accurately not parallel each other, then when intermediate transfer belt 41 moves, intermediate transfer belt 41 may along the direction deflection perpendicular to band direction of transfer X.
Such as, when the right part (that is, belt pulley 56 side) of jockey pulley 43 upwards offsets as shown in Figure 11 A and 11B, then because intermediate transfer belt 41 is perpendicular to the trend of the axial direction movement of jockey pulley 43, intermediate transfer belt 41 moves along the track Xt shown in Figure 11 A.As a result, intermediate transfer belt 41 deflection on the tape skew direction Y1 perpendicular to band direction of transfer X.Within one week by driven roller 43, rotate, intermediate transfer belt 41 is deflection amount as shown in Figure 11 A " m " on the Y1 of tape skew direction.In Figure 11 A, solid line indicates the track Xt on driven roller 42 and jockey pulley 43, and dotted line indicates the track Xt of driven roller 42 and jockey pulley less than 43.
On the contrary, when the right part (that is, belt pulley 56 side) of jockey pulley 43 offsets downward as shown in Figure 11 C and 11D, intermediate transfer belt 41 is deflection on the tape skew direction Y2 shown in Figure 11 C.
The deflection of intermediate transfer belt 41 is by the inequality of the tension force of not parallel, the intermediate transfer belt 41 of driven roller 42, jockey pulley 43 and backing roll 44 (such as, the difference of the bias force between spring 53L and 53R at the both ends of tension force roll shaft 43a), the difference of circumferential lengths between two lateral ends of intermediate transfer belt 41, intermediate transfer belt 41 to cause around the cylindricity etc. of each roller (that is, driven roller 42, jockey pulley 43 and backing roll 44) of tensioning.
Integrated operation
The integrated operation of Description Image forming apparatus 10 is carried out with reference to Fig. 1 and Fig. 2.
In FIG, the image formation control unit 100 of image processing system receives view data by I/F control module 101 from main equipment 10A, and starts image forming operation.Image formation control unit 100 makes feeding transmit control unit 109 drive feeding motor 115.The roller 12a that picks up of medium feed unit 12 drives by being fed to motor 115, and picks up recording medium P from dielectric disc 11.Arrive clamping part between feed roller 12b and reduction roll 12c by picking up recording medium P that roller 12a picks up, and be fed to individually.
Then, the recording medium P be fed to by medium feed unit 12 arrives medium transfer unit 13, and is transmitted 13a, 13b and 13c by transfer roller, arrives the transfer roll 15 as secondary transfer printing portion.
Charging roller 32(32C, 32M, 32Y, 32K) applied negative voltage (such as ,-1000V) by charging voltage control module 102, and by OPC drum 31(31C, 31M, 31Y, 31K) surface be charged as negative potential (such as ,-600V).Head control module 103 make printhead 33(33C, 33M, 33Y, 33K) according to the view data sent from main equipment 10A come to OPC drum 31(31C, 31M, 31Y, 31K) surface expose, to form sub-image on OPC drum 31.
Developing roll 34(34C, 34M, 34Y, 34K) be rasterized voltage control unit 104 and apply negative voltage (such as ,-200V), and utilize by ink powder feeding unit 35(35C, 35M, 35Y, 35K) ink powder supplied is at OPC drum 31(31C, 31M, 31Y, sub-image is showed, to form the ink powder image (that is, visual image) as developer image 31K).As the transfer roll 14(14C in primary transfer portion, 14M, 14Y, 14K) applied positive voltage (such as ,+1500V) by primary transfer voltage control unit 105.Be formed at OPC drum 31(31C, 31M, 31Y, 31K) on the clamping part of ink powder image between OPC drum 31 and transfer roll 14 be transferred to intermediate transfer belt 41, make charge ink powder image be formed on intermediate transfer belt 41.In this regard, backing roll 44 is connected to frame ground (that is, ground connection).
Under the control of image formation control unit 100, ink powder image forming unit 30(30C, 30M, 30Y, 30K) OPC drum 31 and intermediate transfer belt 41 driven synchronously with one another, the ink powder image of each color is transferred to intermediate transfer belt 41.Be formed at ink powder image on intermediate transfer belt 41 and be carried to transfer roll 15 as secondary transfer printing portion by intermediate transfer belt 41.Transfer roll 15 applies positive voltage (such as ,+3000V) by secondary transfer printing voltage control unit 106.Due to the electric field that the backing roll 44 of transfer roll 15 and ground connection is formed, ink powder image is transferred to recording medium P from intermediate transfer belt 41.
Ink powder image is transferred to this recording medium P by transfer roll 15 by recording medium P() be sent to fixation portion 16.Fixation portion 16 applies heat and pressure to recording medium P, to make ink powder image melt also fixation in recording medium P.Then, recording medium P is discharged to stack portion 18 by distributing roller to 17a, 17b and 17c.
The operation of transfer belt unit
The operation of the transfer belt unit 40 according to the first embodiment is described with reference to Fig. 7 A to Figure 10.
Due to the flatness of the mounting surface of image processing system 10, the error, scale error etc. that bend, assemble of framework 51L and 51R, jockey pulley 43 may tilt as seen in figure 7 c.In this case, as shown in Figure 8, the tension force roll shaft 43a of jockey pulley 43 also tilts, therefore, the elongated hole 55a that bar 55(and tension force roll shaft 43a passes) at the E1 place, position of the circumference of elongated hole 55a contact tension force roll shaft 43a.Bar 55 is applied in the power along the direction (that is, downward) shown in arrow D1 at E1 place, position.Therefore, bar 55 rotates up around the side of rotation O3 shown in arrow " a " being fixed on framework 51L.
Belt pulley 56 is arranged between bar 55 and jockey pulley 43, can move along jockey pulley 43 in the axial direction.When bar 55 rotates up in the side shown in arrow " a ", bar 55 is at E2 place, position contact belt pulley 56.Along with bar 55 contacts belt pulley 56, power is applied to belt pulley 56 along the direction shown in arrow D2 by bar 55.Therefore, belt pulley 56 roughly slides along tension force roll shaft 43a on the direction shown in arrow D2.
Intermediate transfer belt 41 is at the flange part 56b of E3 place, position contact belt pulley 56.When belt pulley 56 moves along tension force roll shaft 43a, intermediate transfer belt 41 is applied in by the power in direction shown in arrow D3 at position E3.Therefore, intermediate transfer belt 41 moves towards bearing 54R side.
In this condition, when CD-ROM drive motor 110 starts to make driven roller 42 rotate, intermediate transfer belt 41 and jockey pulley 43 rotate along with the rotation of driven roller 42.Therefore, intermediate transfer belt 41 is shown in Figure 11 C at tape skew direction Y2() upper deflection, intermediate transfer belt 41 presses belt pulley 56, and this belt pulley 56 has flange 56b, and this flange 56b contacts the lateral ends of intermediate transfer belt 41 at position E3 with E4 as shown in Figure 8.Intermediate transfer belt 41 presses belt pulley 56 with the power F in the direction contrary with direction D3.
As a result, belt pulley 56 slides along tension force roll shaft 43a at axial direction (that is, tape skew direction Y2).Along with belt pulley 56 slides along tape skew direction Y2, bar 55 by the direction contrary with direction D2 press, the direction of bar 55 shown in arrow b rotates.Along with bar 55 rotates, tension force roll shaft 43a press by the elongated hole 55a of bar 55, mobile in the direction (that is, upwards) contrary with direction D1.
In this condition, arm 52(Fig. 3 of spring bearing 54L) rotate up around the side of rotation 52a shown in arrow f, bearing 54L moves towards the position shown in Fig. 7 B.In theory, intermediate transfer belt 41 stably moves under the state shown in Fig. 7 B.In reality, stably move under the state of the friction force isoequilibrium of intermediate transfer belt 41 between the weight, corresponding component of intermediate transfer belt 41 and arm 52.
Under the state shown in Fig. 7 B, the rotation O2 of jockey pulley 43 is basically parallel to the rotation O1 of driven roller 42.Therefore, if the rotation O1 of driven roller 42 is parallel to the rotation of backing roll 44, then the deflection of intermediate transfer belt 41 reduces, and intermediate transfer belt 41 stably moves under the state shown in Fig. 7 B.
On the contrary, when jockey pulley 43 tilts as shown in Figure 7 A, then the direction deflection of intermediate transfer belt 41 shown in the Y1 of tape skew direction, and belt pulley 56 moves on the Y1 of tape skew direction.Bar 55 is rotated down around rotation O3, and protuberance 55b, to pressing down belt pulley 56, makes belt pulley 56 move towards the position shown in Fig. 7 B.In this condition, intermediate transfer belt 41 stably moves.
The tilt operation of jockey pulley 43 has been described with reference to the operation (that is, situation 1) from Fig. 7 C to Fig. 7 B and the operation (that is, situation 2) from Fig. 7 A to Fig. 7 B.No matter jockey pulley 43 in which direction tilts, and bar 55 makes jockey pulley 43 tilt to correct the deflection of intermediate transfer belt 41.
Such as, even if intermediate transfer belt 41 and jockey pulley 43 are not correctly installed to predetermined position in the assembling process of transfer belt unit 30, once intermediate transfer belt 41 starts mobile, then due to the thrust acting on the lateral ends of belt pulley 56 and intermediate transfer belt 41 on Y1 and Y2 of tape skew direction, intermediate transfer belt 41 becomes the state that intermediate transfer belt 41 stably moves (not having deflection).
As mentioned above, the rotation of the rotation O2 of jockey pulley 43 and the rotation O1 of driven roller 42 and backing roll 44 becomes almost parallel, reduces the deflection of intermediate transfer belt 41, causes intermediate transfer belt 41 stably move and do not have deflection.In this condition, the lateral ends of intermediate transfer belt 41 and belt pulley 56 can be retained as and contact with each other with little contact force.
Next, the friction force (load) between the inner peripheral surface of the intermediate transfer belt 41 during the tilt operation of jockey pulley 43 and the outside surface of jockey pulley 43 is described in reference to Figure 12,13 and 14.
Afterwards, the axial direction (identical with the Width of intermediate transfer belt 41) of jockey pulley 43 will be also referred to as Width.
Figure 12 is the schematic diagram of display state of the inner peripheral surface of intermediate transfer belt 41 and the outside surface of jockey pulley 43 when jockey pulley 43 tilts.The jockey pulley 43 of Figure 12 is not separated into multiple roller segment.
When jockey pulley 43 tilts around inclination center (that is, fulcrum) O1a, jockey pulley 43 rotates owing to contacting with the inner peripheral surface of intermediate transfer belt 41.Because jockey pulley 43 has the length extended on most of width of intermediate transfer belt 41, therefore skid between the outside surface and the inner peripheral surface of intermediate transfer belt 41 of jockey pulley 43.
In this condition, be different from the position close to the O1a of inclination center with from the skidding amount between the position away from the O1a of inclination center.When the widthwise central R2C(of jockey pulley 43 is, center on the axial direction of jockey pulley 43) when rotating along track R2 around inclination center O1a, the outside surface of jockey pulley 43 and the inner peripheral surface of intermediate transfer belt 41 relative to each other rotate around widthwise central R2C, form skidding part 60(hypothesis and do not skid at widthwise central R2C).
That is, between the inner peripheral surface and the outside surface of jockey pulley 43 of intermediate transfer belt 41, friction force is produced.In this case, the tilt operation of jockey pulley 43 can not successfully perform, and skew correction (being described with reference to Fig. 7 A to Fig. 9 C) can not perform satisfactorily.
Figure 13 is the schematic diagram that display skidding occurs in the state of the widthwise central R2C of jockey pulley 43, and wherein, the outside surface of jockey pulley 43 rotates relative to the inner peripheral surface of intermediate transfer belt 41.The jockey pulley 43 of Figure 13 is not separated into multiple roller segment.
In fig. 13, the width means of the roller body (that is, except tension force roll shaft 43a) of jockey pulley 43 is B.Friction force between the outside surface of the driven roller 43 on per unit length and the inner peripheral surface of intermediate transfer belt 41 is expressed as S.Herein, suppose to be applied to tensile force on jockey pulley 43 and friction force is all definite value due to the tension force of intermediate transfer belt 41 at Width.The square produced at the widthwise central R2C of jockey pulley 43 is expressed as Mc.Center O3a(in the right part of jockey pulley 43 namely, center, right part O3a) square that produces is expressed as Ms.Herein, suppose that center, right part O3a is the inclination center of jockey pulley 43.Friction force between the outside surface of jockey pulley 43 and the inner peripheral surface of intermediate transfer belt 41 is expressed as F.
The friction force produced equally at left part and the right part of jockey pulley 43 is expressed as follows:
F=(B/2)×S...(1)
This friction force F results from left part and the right part that each widthwise central R2C apart from jockey pulley 43 is r=B/4 place, supposes that friction force is evenly distributed on Width.Square Mc is expressed as follows:
Mc=2×F×r
Mc=(1/4)×B
2×s...(2)
Distance r from widthwise central R2C to center, right part O3a is set as that L/2(namely, r=L/2).Utilize distance r, be expressed as follows around the square Ms of center, right part O3a:
Ms=Mc/r
Ms=(2/B)×Mc
Ms=(1/2)×B×s...(3)
Next, will the inner peripheral surface and according to the jockey pulley 43(of the first embodiment namely of intermediate transfer belt 41 be described, be divided into the jockey pulley 43 of 5 roller segments fifty-fifty) outside surface between friction force.
Figure 14 is showing the schematic diagram of the state producing friction force at widthwise central R3-1, R3-2, R3-3, R3-4 and R3-5 place of each roller segment 43-1,43-2,43-4,43-4 and 43-5, wherein, the outside surface of roller segment 43-1 to 43-5 rotates relative to the inner peripheral surface of intermediate transfer belt 41.
The jockey pulley 43 being separated into roller segment 43-1 to 43-5 tilts around center, right part O3a, described by with reference to Figure 12 and Figure 13.Herein, suppose that the outside surface of roller segment 43-1 to 43-5 rotates, the inner peripheral surface of the intermediate transfer belt 41 at the widthwise central place of roller segment 43-1 to 43-5 is not skidded.In this case, skid between the outside surface and the inner peripheral surface of intermediate transfer belt 41 of each roller segment 43-1 to 43-5, the outside surface of roller segment 43-1 to 43-5 is rotated around widthwise central R3-1 to R3-5.
In fig. 14, the width means of the roller body (that is, roller segment 43-1 to 43-5) of jockey pulley 43 is B.The number (that is, the number of roller segment) separated is expressed as t.Friction force between the outside surface of the driven roller 43 on per unit length and the inner peripheral surface of intermediate transfer belt 41 is expressed as S.Herein, suppose to be applied to tensile force on jockey pulley 43 and friction force is all definite value due to the tension force of intermediate transfer belt 41 at Width.The square produced at widthwise central R3-1, R3-2, R3-3, R3-4 and R3-5 place of roller segment 43-1 to 43-5 is expressed as Mc.Square Mc is assumed to be the inclination center of jockey pulley 43 at center, right part O3a() place produce square be expressed as Ms.Friction force between the outside surface of roller segment 43-1 to 43-5 and the inner peripheral surface of intermediate transfer belt 41 is expressed as F.
The friction force that the left part of each in roller segment 43-1 to 43-5 and right part produce equally is expressed as follows:
F=B×S/(2×S)...(4)
This friction force F results from left part and the right part at the distance r place of each in distance widthwise central R3-1 to R3-5, supposes that friction force is distributed in Width equably.Distance r and distance r produce square Mc be expressed as follows:
r=B/4×t
Mc=2×F×r
Mc=B
2×S/(4×t
2)...(5)
Square Ms around the right-hand member center O3a of jockey pulley 43 will determine as follows.Wherein, N represents separation number (that is, the number of the roller segment of jockey pulley 43).
From right-hand member center O3a(namely, the center of square Ms) arrive widthwise central R3-1 to R3-5(namely, the center of square Mc) the distance r of each
nbe expressed as follows:
r
n=B{(k-1)/t+(1/(2×t))}
Then, following equation is obtained:
Herein, above-mentioned equation (5) substitutes into equation (f), obtains following equation:
Therefore, following equation is obtained:
When separating number t=1 and substituting into equation (7), obtain following equation:
Ms=(1/2)×B×S
This is the equation identical with above-mentioned equation (3).
When separating number t=5 and substituting into equation (7), obtain following equation:
Therefore, when separation number t is 5, compared with when being 1 with separation number t, square Ms reduces about 36%.
Table 1 show based on equation (7) determined to be separation number compared with in the of 100% with square Ms when to separate number t be 1 be 1 to 10 square Ms.
Table 1
| Separate number t | Square Ms(%) |
| 1 | 100 |
| 2 | 67 |
| 3 | 51 |
| 4 | 42 |
| 5 | 36 |
| 6 | 31 |
| 7 | 28 |
| 8 | 25 |
| 9 | 23 |
| 10 | 21 |
Figure 15 is the figure of the relation between the ratio of the square Ms that the display separation number t of jockey pulley 43 and friction cause.
In fig .15, transverse axis indicates and separates number t.The longitudinal axis indicates relative to square Ms(100% when to separate number be 1) the ratio of (separating number 1 to 10) square Ms.
According to Figure 15, it is near the point of 3.3 that the turning point of the ratio curve of square Ms is positioned at separation number t.This means the effect that more effectively can obtain the first embodiment when separating number t and being more than or equal to 4.
In theory, along with the increase of separating number t, the effect of the first embodiment can more effectively be obtained.But in reality, preferably, the broadband of each of the roller segment 43-1 to 43-5 of jockey pulley 43 is more than or equal to 30mm.This is because, if the width of roller segment is less than 30mm, then may produces gap between jockey pulley 43 and tension force roll shaft 43a, and the load on jockey pulley 43 may be increased.
The upper limit separating number t is determined by the maximum sheets of sizes of recording medium P used in image processing system 10.Such as, if are A3 sizes for the maximum sheets of sizes of the recording medium P of image processing system 10, the sheet width that so the width L of jockey pulley 43 is defined as approximating greatly 297mm adds 40mm.If the maximum sheets of sizes for the recording medium P of image processing system 10 is A4 size, the sheet width that so the width L of jockey pulley 43 is defined as approximating greatly 210mm adds 40mm.
That is, when image processing system 10 is configured to the recording medium P using A3 size, the separation number t of jockey pulley 43 is preferably less than or equal to 10.When image processing system 10 is configured to the recording medium P using A4 size, the separation number t of jockey pulley 43 is preferably less than or equal to 8.
As a result, when image processing system 10 is configured to the recording medium P using A3 size, the separation number t of jockey pulley 43 is preferably placed at from the scope of 4 to 10.When image processing system 10 is configured to the recording medium P using A4 size, the separation number t of jockey pulley 43 is preferably placed at from the scope of 4 to 8.
As mentioned above, because jockey pulley 43 is separated into multiple roller segment 43-1 to 43-5 at axial direction, the load on the jockey pulley 43 that causes due to the friction between the outside surface of jockey pulley 43 and the inner peripheral surface of intermediate transfer belt 41 during tilt operation can be reduced.
More specifically, because the friction force between jockey pulley 43 and intermediate transfer belt 41 is disperseed, the contact force therefore between flange part 56b and intermediate transfer belt 41 becomes constant.Therefore, when (in intermediate transfer belt 41 deflection) intermediate transfer belt 41 is directed to settling position by the flange part 56b of belt pulley 56, intermediate transfer belt 41 can be prevented to be out of shape because of the over load by flange 56b.
Foregoing description carries out when supposing that the skidding between jockey pulley 43 and intermediate transfer belt 41 does not occur in the widthwise central R2C of jockey pulley 43.But the part not occurring to skid can be positioned at other position any on the rotation O2 of jockey pulley 43.
Advantage
According to transfer belt unit 40, jockey pulley 43 is separated into multiple roller segment 43-1 to 43-5 in the axial direction, and roller segment 43-1 to 43-5 can rotate independently.Therefore, it is possible to the friction between the outside surface of jockey pulley 43 during reduction tilt operation and the inner peripheral surface of intermediate transfer belt 41.Therefore, jockey pulley 43 successfully can perform tilt operation with little load.Therefore, it is possible to reduce the contact force (stress) between the lateral ends of intermediate transfer belt 41 and belt pulley 56.As a result, the life-span of transfer belt unit 40 can be extended.
Second embodiment
Structure
Figure 16 A and 16B is display according to the jockey pulley 43 of the first embodiment and jockey pulley 43A(according to a second embodiment of the present invention as the first rotary part) be all in the schematic diagram of assembled state.Figure 17 shows the jockey pulley 43A of the second embodiment shown in Figure 16 B.
Except jockey pulley 43(43A) except, the transfer belt unit of the second embodiment is identical with the transfer belt unit 40 of the first embodiment.
As shown in Figure 16 A, the jockey pulley 43(roller segment 43-1 to 43-5 of the first embodiment) there is straight shape.That is, the external diameter G1 of the center of jockey pulley 43 is identical with the external diameter G1 of the end of jockey pulley 43.On the contrary, in a second embodiment, as shown in fig 16b, jockey pulley 43A(roller segment 43A-1 to 43A-5) the external diameter G3 of center be greater than the external diameter G2 of two ends of jockey pulley 43A.
More specifically, the jockey pulley 43A of the second embodiment has crown shapes, makes the external diameter G3 of the center of jockey pulley 43A be a bit larger tham the external diameter G2 of two ends of jockey pulley 43A.
Difference between the external diameter G3 of two ends of external diameter G2 and jockey pulley 43 will consider that the bending of tension force roll shaft 43a caused when by spring 53L and 53R tension force being applied to intermediate transfer belt 41 is determined.
As shown in figure 17, tension force roll shaft 43a through the roller segment 43A-1 to 43A-5 of jockey pulley 43A, with backing roll part 43A-1 to 43A-5 rotatably.Roller segment 43A-1 to 43A-5 has lug boss 43Ab-1,43Ab-2,43Ab-3,43Ab-4 and 43Ab-5 of annular, and forms gap 43Ad between adjacent roller segment 43A-1 to 43A-5.As mentioned above, the external diameter G2 of two ends of jockey pulley 43A is less than the external diameter G3 of the center of jockey pulley 43A.Owing to providing gap 43Ad, even if work as the flex under action of the power of tension force roll shaft 43a shown in arrow E, roller segment 43Ab-1 to 43Ab-5 does not also interfere mutually.In addition, when tension force roll shaft 43a bends, the outside surface on the side (in Figure 17 by line F shown in) contrary with driven roller 42 of roller segment 43Ab-1 to 43Ab-5 is aimed at substantially as the crow flies, as shown in fig 16b.
Operation
The image processing system 10 of the second embodiment is identical with the first embodiment with the operation of transfer belt unit 40.
By the operation of the jockey pulley 43A of description second embodiment.The jockey pulley 43 of Figure 16 has straight shape, and is divided into multiple roller segment, as in the first embodiment.In this case, when causing tension force roll shaft 43a to bend owing to being applied to the tension force on intermediate transfer belt 41 by spring 53L and 53R, cause the tensile force T1(per unit width of the end of jockey pulley 43) and the tensile force T2(per unit width of center of jockey pulley 43) between difference.
Due to jockey pulley 43(Figure 16 A) be divided into multiple roller segment, the bending strength of jockey pulley 43 is relatively low on the whole.Therefore, the difference between tensile force T1 and T2 becomes larger.Depend on the intensity of tension force roll shaft 43a and the spring force of spring 53L and 53R, may intensively produce large tensile force in the end of jockey pulley 43.In this case, the drawing stress at the lateral ends place of intermediate transfer belt 41 in the circumferential may increase, and the life-span of intermediate transfer belt 41 may reduce.
As countermeasure, can by such as increasing the external diameter of tension force roll shaft 43a or using tubular shaft to strengthen the rigidity of tension force roll shaft 43a.But in this case, the weight of tension force roll shaft 43a may increase, or manufacturing cost may increase.
On the contrary, according to the second embodiment, as mentioned above, at tension force roll shaft 43A(roller segment 43A-1 to 43A-5) the external diameter G2 at both ends place be less than the external diameter G3 of the center of jockey pulley 43A.Therefore, as shown in fig 16b, the tensile force T3(per unit width of the end of jockey pulley 43A can be reduced) and the tensile force T4(per unit width of center of jockey pulley 43A) between difference.
Advantage
According to the second embodiment, jockey pulley 43A is separated into multiple roller segment, and has the shape making the external diameter G3 of center be greater than the external diameter G2 of end.Therefore, the tensile force T3(per unit width of the end of jockey pulley 43A can be reduced), the difference between the tensile force T4 that can reduce the tensile force T3 of the end of jockey pulley 43A and the center of jockey pulley 43A.Therefore, intermediate transfer belt 41 becomes and can successfully move.In addition, due to the drawing stress at the lateral ends place of intermediate transfer belt 41 can be reduced, therefore, it is possible to extend the life-span of transfer belt unit 40.
Modification
Following modification can be carried out to above-described embodiment.
In the first and second embodiment, the transfer belt unit 40 that tape drive is used as to adopt in electrophotographic printer is described.But tape drive of the present invention may be used for other image processing system, electrofax is such as used to form the duplicating machine, facsimile recorder etc. of image on the recording medium.
In the first and second embodiment, describe the image processing system 10 of tape drive for intermediate transfer type, it forms developer image and is transferred on recording medium P by developer image on intermediate transfer belt 41.But tape drive of the present invention can be applied to the image processing system of direct transfer type, it forms developer image on OPC drum 31, and developer image is directly transferred to recording medium P from OPC drum.
In the first and second embodiment, the transfer belt unit 40 that tape drive is used as to adopt in electronic photographic image forming device is described.But tape drive of the present invention can also be applied to the fixation unit and media transport device that use endless belt.In addition, tape drive of the present invention can be used in other object except electronic photographic image forming device, as long as use endless belt (that is, tension part).
In the first and second embodiment, endless belt (more specifically, being intermediate transfer belt) is described as the example of tension part.But, other tension part can also be used, all if any holding (other than ring type) band, annular sheet material, having dististyle material etc.
Figure 18 A shows the jockey pulley 43B of the modification according to the second embodiment.Although the jockey pulley 43A(of the second embodiment is shown in Figure 16 B and 17) there is the shape of imperial crown, but the jockey pulley 43B(of this modification is shown in Figure 18 B) there is conical by its shape, external diameter increases gradually from each end towards the center of jockey pulley 43B, and the difference between the diameter of the opposite end of adjacent roller parts is minimized.
In order to contrast, Figure 18 B show schematically show the crown shapes (Figure 16 B and Figure 17) of the jockey pulley 43A of the second embodiment, and Figure 18 C show schematically show the jockey pulley 43B(18A of modification) conical by its shape.As shown in figure 18b, the jockey pulley 43A of the second embodiment has crown shapes, and its periphery has axially continuous print smooth curve C.As shown in figure 18 c, the jockey pulley 43B of modification has conical by its shape, and its periphery comprises multiple straight taper T.If jockey pulley 43B comprises odd number roller segment, then intermediate calender rolls part has drum.Utilize the jockey pulley 43B with conical by its shape as shown in Figure 18 A and 18C, the advantage identical with the second embodiment can be obtained.
In addition, the feature of the jockey pulley 43 in the first and second embodiments can also be applied to backing roll 44 and/or driven roller 42.
Such as, Figure 19 shows a kind of modification, and wherein, the feature (Figure 16 B and Figure 17) of the second embodiment is applied to driven roller 42.
The driven roller 42A being shown in Figure 19 is separated into multiple roller segment.More specifically, driven roller 42A is separated into the roller segment 42c in the center of driven roller 42, and the roller segment 42d in the both sides of roller segment 42c.Roller segment 42c is fixed on drive roller shaft 42b, and has the peripheral surface of high friction.Roller segment 42d is rotatably supported by drive roller shaft 42b, and each roller segment 42d has taper, and external diameter is increased towards roller segment 42c.With this modification, the advantage described in the second embodiment can be obtained.
Figure 20 A and 20B is the zoomed-in view of the modification of the structure of the end of display jockey pulley 43.As shown in FIG. 20 A, strengthening part 41a can be set in the lateral ends of intermediate transfer belt 41.In addition, as shown in fig. 20b, guide member 41b can be set in the inner peripheral surface at the lateral ends place of intermediate transfer belt 41.In this case, belt pulley 56 is provided with groove 56c, and this groove 56c engages guide member 41b.With this modification, the advantage described in the first and second embodiments can be obtained.
Although understand the preferred embodiments of the present invention in detail, it is clear that modification and improvement can be made to the present invention when not departing from the spirit and scope of claims of the present invention.
Claims (9)
1. a driving arrangement (40), comprising:
Tension part (41);
First rotary part (43-1 ~ 43-5) and the second rotary part (42), described first rotary part (43-1 ~ 43-5) is for multiple, described tension part (41) is around described multiple first rotary part (43-1 ~ 43-5) and described second rotary part (42) tensioning, described first rotary part (43-1 ~ 43-5) is arranged along the first rotation (O2), described first rotary part (43-1 ~ 43-5) is made to rotate around described first rotation (O2) and can not move on the axial direction of described first rotation (O2), described second rotary part (42) can rotate around the second rotation (O1),
Belt pulley (56), described belt pulley (56) is arranged on the first side of described first rotary part (43-1 ~ 43-5), described belt pulley (56) has tapered portion (56a), described tapered portion (56a) can with the ends contact of described tension part (41);
First adjustment member (58), described first adjustment member (58) is arranged on described first side of described first rotary part (43-1 ~ 43-5), and described first adjustment member (58) is positioned between described belt pulley (56) and described first rotary part (43-1 ~ 43-5); And
Second adjustment member (58), described second adjustment member (58) is arranged on the second side of described first rotary part (43-1 ~ 43-5),
Wherein, each of described first rotary part (43-1 ~ 43-5) comprises diameter major part (43c) and smaller-diameter portion (43b),
Wherein, described first adjustment member (58) contacts described diameter major part (43c), and described second adjustment member (58) contacts described smaller-diameter portion (43b), to regulate moving axially of described first rotary part (43-1 ~ 43-5).
2. driving arrangement (40) as claimed in claim 1, wherein, the number of described multiple first rotary part (43-1 ~ 43-5) is from the scope of 4 to 10.
3. driving arrangement (40) as claimed in claim 1, wherein, forms gap (d) between adjacent described first rotary part (43-1 ~ 43-5).
4. driving arrangement (40) as claimed in claim 1, wherein, described diameter major part (43c) forms tensioned portion (43c), described tension part (41) around described tensioned portion (43c) tensioning, and,
Described smaller-diameter portion (43b) forms abutting part (43b), and described abutting part (43b) is given prominence to from described tensioned portion (43c) on the described axial direction of described first rotation (O2).
5. driving arrangement (40) as claimed in claim 1, wherein, the external diameter (G2) of described first rotary part (43-1,43-5) at the two ends place of described first rotary part (43-1 ~ 43-5) is greater than at the external diameter (G3) of described first rotary part (43-4) of the center of described first rotary part (43-1 ~ 43-5).
6. driving arrangement (40) as claimed in claim 1, wherein, the two ends from the center of described first rotary part (43-1 ~ 43-5) to described first rotary part (43-1 ~ 43-5), the external diameter of described first rotary part (43-1 ~ 43-5) reduces.
7. driving arrangement (40) as claimed in claim 1, also comprise the axle offset parts (55) at least one end being arranged on described first rotary part (43-1 ~ 43-5), described axle offset parts (55) are configured at least one end portion offsets making described first rotation (O2) according to the motion of described tension part (41) on the described axial direction of described first rotation (O2)
Wherein, described axle offset parts (55) have the 3rd rotation (O3) tilted relative to described first rotation (O2), and rotate, to make described first rotation (O2) offset around described 3rd rotation (O3).
8. driving arrangement (40) as claimed in claim 1, also comprises:
Be arranged on the axle offset parts (55) at least one end of described first rotary part (43-1 ~ 43-5), described axle offset parts (55) are configured at least one end portion offsets making described first rotation (O2) according to the motion of described tension part (41) on the described axial direction of described first rotation (O2)
Described belt pulley (56) is arranged between described axle offset parts (55) and described first rotary part (43-1 ~ 43-5), and described belt pulley (56) has the contact site (56b) of the described tension part of contact (41),
Wherein, described belt pulley (56) moves on the described axial direction of described first rotation (O2), makes described contact site (56b) contact described tension part (41) according to the rotation of described axle offset parts (55).
9. an image processing system (10), comprising:
Driving arrangement according to any one of claim 1 to 8 (40),
Form the image forming part (20) of developer image, and
By the fixation portion (16) of described developer image orientation to medium (P).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-208806 | 2010-09-17 | ||
| JP2010208806A JP5312417B2 (en) | 2010-09-17 | 2010-09-17 | Belt drive device and image forming apparatus having the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102411291A CN102411291A (en) | 2012-04-11 |
| CN102411291B true CN102411291B (en) | 2016-02-24 |
Family
ID=44936164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110275271.4A Active CN102411291B (en) | 2010-09-17 | 2011-09-16 | Driving arrangement and image processing system |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9014603B2 (en) |
| EP (1) | EP2431815A3 (en) |
| JP (1) | JP5312417B2 (en) |
| CN (1) | CN102411291B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5915575B2 (en) | 2013-03-25 | 2016-05-11 | ブラザー工業株式会社 | Image forming apparatus |
| JP2014232229A (en) * | 2013-05-29 | 2014-12-11 | 株式会社沖データ | Fixing device and image forming apparatus |
| JP5923462B2 (en) * | 2013-06-20 | 2016-05-24 | 京セラドキュメントソリューションズ株式会社 | Fixing apparatus and image forming apparatus |
| JP2016004236A (en) * | 2014-06-19 | 2016-01-12 | シャープ株式会社 | Belt drive device and image forming apparatus |
| JP6178767B2 (en) * | 2014-08-29 | 2017-08-09 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| JP6522478B2 (en) * | 2015-10-01 | 2019-05-29 | 株式会社沖データ | Belt unit, transfer unit and image forming apparatus |
| US10809949B2 (en) | 2018-01-26 | 2020-10-20 | Datamax-O'neil Corporation | Removably couplable printer and verifier assembly |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4397538A (en) * | 1981-09-03 | 1983-08-09 | Xerox Corporation | Belt alignment system |
| JPH0854790A (en) * | 1994-08-12 | 1996-02-27 | Fuji Xerox Co Ltd | Image forming device |
| CN1219472A (en) * | 1997-12-11 | 1999-06-16 | 三星电子株式会社 | Photoreceptor web steering apparatus for printer |
| JP2007008677A (en) * | 2005-06-30 | 2007-01-18 | Kyocera Mita Corp | Belt conveyance device in image forming device |
| JP2009265421A (en) * | 2008-04-25 | 2009-11-12 | Brother Ind Ltd | Belt unit and image forming apparatus |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0798563B2 (en) * | 1989-01-23 | 1995-10-25 | オークラ輸送機株式会社 | Belt conveyor |
| JPH0880268A (en) * | 1994-09-13 | 1996-03-26 | Toto Ltd | Lighting equipment for bathtub |
| JPH08282009A (en) * | 1995-04-10 | 1996-10-29 | Canon Inc | Image forming device |
| JPH09297469A (en) * | 1996-05-07 | 1997-11-18 | Matsushita Electric Ind Co Ltd | Image forming device |
| JPH10194419A (en) * | 1997-01-09 | 1998-07-28 | Bando Chem Ind Ltd | Belt drive device |
| JP4245891B2 (en) * | 2002-10-07 | 2009-04-02 | 株式会社リコー | Belt carrier and image forming apparatus |
| JP4087677B2 (en) * | 2002-10-07 | 2008-05-21 | 株式会社金陽社 | Belt device and printing machine |
| JP4413759B2 (en) * | 2004-12-02 | 2010-02-10 | 株式会社沖データ | Belt drive device and image forming apparatus having the same |
| JP4794281B2 (en) * | 2005-11-16 | 2011-10-19 | 株式会社沖データ | Belt drive device and image forming apparatus having the same |
| JP4808115B2 (en) * | 2006-09-15 | 2011-11-02 | 株式会社沖データ | Belt device and image forming apparatus |
| JP2008129494A (en) * | 2006-11-24 | 2008-06-05 | Oki Data Corp | Belt conveyance device and image forming apparatus |
-
2010
- 2010-09-17 JP JP2010208806A patent/JP5312417B2/en active Active
-
2011
- 2011-09-15 US US13/233,047 patent/US9014603B2/en active Active
- 2011-09-15 EP EP11181432.3A patent/EP2431815A3/en not_active Withdrawn
- 2011-09-16 CN CN201110275271.4A patent/CN102411291B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4397538A (en) * | 1981-09-03 | 1983-08-09 | Xerox Corporation | Belt alignment system |
| JPH0854790A (en) * | 1994-08-12 | 1996-02-27 | Fuji Xerox Co Ltd | Image forming device |
| CN1219472A (en) * | 1997-12-11 | 1999-06-16 | 三星电子株式会社 | Photoreceptor web steering apparatus for printer |
| JP2007008677A (en) * | 2005-06-30 | 2007-01-18 | Kyocera Mita Corp | Belt conveyance device in image forming device |
| JP2009265421A (en) * | 2008-04-25 | 2009-11-12 | Brother Ind Ltd | Belt unit and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102411291A (en) | 2012-04-11 |
| US9014603B2 (en) | 2015-04-21 |
| JP2012063655A (en) | 2012-03-29 |
| EP2431815A2 (en) | 2012-03-21 |
| JP5312417B2 (en) | 2013-10-09 |
| EP2431815A3 (en) | 2013-08-21 |
| US20120070201A1 (en) | 2012-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102411291B (en) | Driving arrangement and image processing system | |
| CN102050338B (en) | Belt driving device and image forming apparatus using the same | |
| US8045904B2 (en) | Apparatus with a steerable belt member adjusting feature | |
| US6871036B2 (en) | Belt driving apparatus and image forming apparatus using the same | |
| US9541881B2 (en) | Recording medium conveying device with a separation support roller and image forming apparatus incorporating the same | |
| US20140086643A1 (en) | Image forming apparatus | |
| US6522850B2 (en) | Image forming apparatus having supporting member for supporting photosensitive belt | |
| US8837997B2 (en) | Belt driving device | |
| US20160161894A1 (en) | Image forming apparatus | |
| JP4013982B2 (en) | Image forming apparatus | |
| US6097922A (en) | Image forming apparatus | |
| US6463247B1 (en) | Color image formation apparatus using plural photosensitive drums | |
| JP3340009B2 (en) | Paper transport device | |
| US7302218B2 (en) | Image forming apparatus with constant conveying velocity | |
| US10747153B2 (en) | Belt-type transport device, fixing device, and image forming apparatus | |
| JP2022088108A (en) | Process unit and image forming apparatus | |
| JPH06278894A (en) | Image forming device | |
| JP2015007690A (en) | Endless belt device and image forming apparatus | |
| US11934115B2 (en) | Transport device | |
| JPH1124350A (en) | Image forming device | |
| EP0903242A2 (en) | Image forming device using photoconductor belt and LED array | |
| JP2006154878A (en) | Image forming apparatus | |
| JPH04144850A (en) | Endless belt carrying device | |
| JPH1165333A (en) | Image forming device | |
| US20040062577A1 (en) | Image forming apparatus and transfer unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220328 Address after: Tiger gate, 1, 7, 12, Tokyo harbour, Japan Patentee after: Oki Electric Industry Co.,Ltd. Address before: Tokyo, Japan Patentee before: Oki Data Corp. |
|
| TR01 | Transfer of patent right |